Syringe ampoule



Jan. 6, 1942. A. E. SMITH SYRINGE AMPOULE Filed Jan. 4, 1941 Ila/47147142711 1N VENTOR.

A. E. SMITH Patented Jan. 6, 1942 SYRINGE slur-min Arthur E. Smith, Los Angeles, Calif. Application January 4, 1941, Serial No. 373,128

1 Claim.

This invention relates to syringe ampoules.

The general object of this invention is to provide a novel ampoule for use in a syringe for administering local anesthetics such as employed by dental surgeons.

A more specific object of this invention is to provide an ampoule having a shoulder and with a closure associated with the shoulder in such a manner as to provide a plurality of compartments whereby a local anesthetic preparation may be maintained separate from its vehicle until the solution is desired for use, whereupon the solution may be freshly prepared and injected.

A more specific object of this invention is to provide an ampoule having a neck portion and a shoulder at one end and having a closure engaging the shoulder and with a second closure on the end of the ampoule forming in conjunction with the disk a chamber in which a medicinal preparation is secured.

Other objects and the advantages of my invention will be apparent from the following description taken in connection with the accompanying drawing wherein:

Fig. 1 is a central sectional view through a syringe and ampoule embodying the features of my invention;

In the end of the ampoule remote from the constriction I2 I arrange a piston cork 22 which includes a rubber body having an end 23 and a recess 24 therein, and having a counterbored recess 25. The forward end of the cork 22 is peripherally rounded as at 26. The disk I4 is provided on the face adjacent the pellet I! with a protuberance '2l,which is shown as frustroconical.

The ampoule is arranged within the barrel 28 of a syringe 29 which includes an end member 30 through which a plunger rod 3| having a head 32 thereon extends. The barrel 28 includes a front member 33 through which a tube 34 extends' The tube 34 has a sharpened closed end 35 and has lateral'holes 36 permitting passage of liquid.

Fig. 2 is a central sectional view showing my' improved ampoule;

Fig. 3 is a central sectional view of the ampoule in the first step of preparing a fresh solution; and

Fig. 4 is a view showing the relation of the parts after the contents of the ampoule have been discharged.

Referring to the drawing by reference characters I have shown my invention as embodied in a syringe ampoule which is indicated generally at M. As shown, the ampoule comprises an elongated substantially cylindrical body H having a constriction I2 at one end which forms an inner shoulder l3 directed toward the end of the ampoule. Mounted upon the shoulder I3, I arrange a disk l4 which maybe made of rubber or other suitable soft material.

A needle 31 is arranged on the front member 33 and includes an inner end 38 which extends into the tube 34. The needle also includes an injecting end 39.

In use the ampoule is placed in the syringe and is moved forward in the barrel causing the tube 34 to pierce the diaphragm l9 and to either push aside or break the pellet H. The sharpened tube then engages the protuberance 21 and cluev to the doubly inclined surfaces of the tube end andprotuberance the disk 34 is canted and the preparation [1 is free to mingle with the vehicle in the ampoule 10.

When an injection is to be made, the plunger 3| is moved forwardly causing the head 32 thereon to engage in advance the piston cork 22 thus forcing the ampoule contents through the holes 36 and through the needle 31. This action continues until the cork has moved to its extreme forward position where it surrounds the disk l4 as shown in Fig. 4.

This construction is designed for ampoules in which it is desired to maintain a drug in a compartment sealed from the solvent for the drug. For example, since novocain deteriorates when in solution, a. novocain tablet or powder may be placed in the chamber in the neck and The disk l4 at its periphery l5 sealingly engages the inner wall of the ampoule and thus provides a compartment l6 in which a medicinal preparation shown as a pellet I1 is arranged. The end of the ampoule adjacent the disk I4 is shown as closed by a resilient rubber cap l8 which includes an end diaphragm portion l9 and a skirt 20, the end portion 2| of which is disposed in the constriction I2 previously described.

the solvent for the novocain placed in the main body of the ampoule. When the disk is forced inwardly the novocain will enter into the solvent providing the desired solution.

From the foregoing description it is apparent that I have invented a novel syringe ampoule which can be economically manufactured and which is highly efficient for its intended purpose.

Having thus described my invention, I claim:

An ampoule for use in a hypodermic syringe which includes a barrel having a front member thereon and having a pointed tubular member the end wall of the neck and a skirt engaging the side walls of the neck, said skirt extending into the restriction, said disk'having a centrally disposed conical outwardly directed protuberance thereon on the face thereof nearest said closure cap, said protuberance being spaced from said closure cap end portion and adapted to be engaged by the pointed member on a syringe to thereby tilt the disk.

ARTHUR E. SMITH. 

